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If you've heard about Nickel Boron Bolt Carrier Groups and wondered what all the fuss was about, you've come to the right place!What are the advantages of a Nickel Boron BCG?Are they worth the money?Do I need one in my AR15 or my AR Pistol?Below are the top 3 reasons your AR15 might need one. Reason #1 - Reliability Of all AR15 parts, the bolt carrier group is without a doubt the most critical component for proper functioning. It is not only the most complicated component but also the hard …